Corrupted Heart

Whenever an opponent casts a spell, they lose 1
life. If Corrupted Heart has 5 or more counters
on it, they lose 2 life instead.
At the beginning of your end step, choose a
counter from among artifact, flying, first strike,
deathtouch, lifelink, menace, reach, trample,
vigilance. Put a counter of that kind and a +1/+1
counter on Corrupted Heart. (An artifact
counter counters the next spell or ability that
targets this creature, and then is removed)